I don’t have a solution for you, only a few observations.
The ORS is now called ‘Access Canberra’. I think you can contact them for general advice on what is legal and what is not or what approvals would be necessary. Worth a try.
I can’t find anything in the Unit Titles (Management) Act that says a unit owner must apply to or notify the Owners Corporation about conducting business within their unit. I suspect you would have to demonstrate nuisance or interference with the use and enjoyment of the common property, which would then be a rule infringement.